forget

THE RISK

Critical Risk

Why forget needs a policy

This tool irreversibly removes data (observations) from the GraphHub knowledge graph memory system. Once deleted, these observations cannot be recovered. While the blast radius is somewhat contained to the specific server's session memory rather than persistent external systems, the destructive nature of permanent data deletion warrants the Destructive category, which takes precedence over Write.

From the tool's definition Tool is named 'forget' and description states 'Delete observations from memory' with multiple deletion filters (by ID, session, project, type, or date).

Documented attack patterns abuse exactly the kind of access forget gives an agent:

POLICY

How to control forget

PolicyLayer is an MCP gateway — it sits between your AI agents and GraphHub, and nothing reaches the server without passing your rules. This is the rule we recommend for forget:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "forget"
  ]
}

forget disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

Create a free account and register GraphHub — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More GraphHub tools

Execute query_graph Run a direct Cypher query against the codebase graph database. Use this to find complex re Write remember_bugfix Record a resolved bug so future agents can reuse the fix pattern. Stores symptom, root cau Write remember_skill_choice Cache which .skill.md / SKILL.md file was used for a task so similar future tasks route to Write remember Save a learning, decision, finding, or other observation to persistent memory. Searchable Write update_observation Update an existing observation Read batch_context Get definition + caller/callee counts for multiple symbols in one call. Replaces N get_con Read changed_symbols List the symbols in files changed by the current branch (or working tree / staged diff). E Read check_arch_rules Enforce architecture boundary rules — detect files that import across forbidden layer boun

All 32 GraphHub tools →

Destructive tools on other servers

Android Forensics ADB MCP Server create_full_backup 0xarchive web3_revoke_key Frida Game Hacking MCP clear_scan cPanel MCP Server clear_spam_box

Go deeper

Critical-risk tools in GraphHub → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about forget

What does the forget tool do? +

Delete observations from memory. Can delete by ID, session, project, type, or date. It is categorised as a Destructive tool in the GraphHub MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on forget? +

Register the GraphHub MCP server in PolicyLayer and add a rule for forget: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches GraphHub. Nothing to install.

What risk level is forget? +

forget is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit forget? +

Yes. Add a rate_limit block to the forget rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block forget completely? +

Set action: deny in the PolicyLayer policy for forget. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides forget? +

forget is provided by the GraphHub MCP server (slnquangtran/graph-hub). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every GraphHub tool call.

Start from GraphHub, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →